Added a sentence to say that it first compares sizes.

diff --git a/finddup.1 b/finddup.1
index a1f2a60..4ba1807 100644 (file)
--- a/finddup.1
+++ b/finddup.1
@@ -19,6 +19,9 @@ files found in it. With two directories, it prints either the files
 common to both DIR1 and DIR2, or with the `not:' prefix, the ones
 present in DIR1 and not in DIR2.
 
+It compares files by first comparing their sizes, hence goes
+reasonably fast.
+
 When looking for identical files,
 .B finddup
 by default associates a group ID to every content, and prints it along